20
Data_code
: 8 bytes long; two 32-bit floating point format of the secondary reading
Checksum
: -((02+09+data_code) && 0x00FF)
02
09 S-B0 S-B1 S-B2 S-B3 S-B0 S-B1 S-B2 S-B3 CS
Remote Mode
:
When in the
Remote
mode, the “RMT” on the LCD will be lit and the 889B is capable of communicating to
remote USB equipped PC or terminal through the build-in USB port. The connection setting is as follow:
Transmission Mode : Half Duplex
Baud Rate
: 9600
Parity Bit
: None
Data Bits
: 8
Stop Bit
: 1
Handshake
: None
In this mode, the LCD display and all keypads except the
Remote
button will be locked. And the external
program through the USB port controls the operation of the 889B.
3.1 Remote Mode Command Syntax
The command syntax of Models 4090 is as following:
COMMAND(?) (PARAMETER)
The format of COMMAND and PARAMETER is as following:
1. There is at least one space between COMMAND and PARAMETER.
2. The PARAMETER should use only ASCII string not numerical code.
3. Value parameter can be integer, floating or exponent with the unit. For example:
50mV
0.05V
5.0e1mV
4. The question mark (?) at the end of COMMAND means a query or a measuring command. For example:
“CpD” sets the measurement mode to Cp and D.
“CpD?” sets the measurement mode to Cp and D as well as measures the values and send them back.
5. The COMMAND and PARAMETER can be either upper or lower case. But the unit to describe the value in the
PARAMETER should have different between milli (m) and mega (M). For example:
1mV equals 0.001V.
1MV equals 1000000V.
6. The “end of command” character should be placed at the end. There are:
ASCII CR (0DH) or
ASCII LF (0AH)
3.2 Remote Mode Commands
Measurement Setting (or Querying) Command
The following measurement mode-setting and the query commands are supported in the 889B. When a mode-setting
command is entered the 889B will return “
OK
” after setting is complete. When query command is entered, the 889B will send
back the values of measurement.
DCR(?)
DC resistance measurement mode setting or querying command.
CpRp(?)
Parallel capacitance and parallel resistance measurement mode setting or querying command.
CpQ(?)
Parallel capacitance and quality factor measurement mode setting or querying command.
CpD(?)
Parallel capacitance and dissipation factor measurement mode setting or querying command.
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